<div>Hi Brian,</div>
<div> </div>
<div>Its about 100mm square. Might be ok to cut in half, but it was only a couple of quid. <br><br></div>
<div class="gmail_quote">On 3 April 2014 21:23, Brian Cox <span dir="ltr"><<a href="mailto:brian@ojaivalleybeefarm.com" target="_blank">brian@ojaivalleybeefarm.com</a>></span> wrote:<br>
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<div>James,</div>
<div> How big is the lens you have? Maybe you could just cut it in half.</div>
<div>
<div class="h5">
<div> </div>
<div><br>Brian </div>
<div><br><br>--- <a href="mailto:jamesf@guernseysubmarine.com" target="_blank">jamesf@guernseysubmarine.com</a> wrote:<br><br>From: James Frankland <<a href="mailto:jamesf@guernseysubmarine.com" target="_blank">jamesf@guernseysubmarine.com</a>><br>
To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] annealing acrylic<br>Date: Thu, 3 Apr 2014 15:58:13 +0100<br>
<br></div>
<div>Hi Brian,</div>
<div> </div>
<div>Ok, thanks. I'll have to get another lense, ive only got 1, but they are cheap enough.</div>
<div> </div>
<div>Many thanks</div>
<div>James<br><br></div>
<div>On 3 April 2014 15:19, Brian Cox <span dir="ltr"><<a href="mailto:brian@ojaivalleybeefarm.com" target="_blank">brian@ojaivalleybeefarm.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:rgb(204,204,204) 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex">
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<div>Hi James,</div>
<div> I used a florescent light in a light table that I had. The lenses have to be opposing each other and on either side of the acrylic. If you look at your lenses closely you'll see that one side is different that the other. So when they are in line with the light source you want them with one " heads and one tails " . Then after you have them like that then slowly turn the top one you have in your hand to reveal the stress layers. The stress layers are really evident in a piece of acrylic that has been drilled, so if you have such a piece try it with that .</div>
<div> </div>
<div>Brian <br><br>--- <a href="mailto:jamesf@guernseysubmarine.com" target="_blank">jamesf@guernseysubmarine.com</a> wrote:<br><br>From: James Frankland <<a href="mailto:jamesf@guernseysubmarine.com" target="_blank">jamesf@guernseysubmarine.com</a>>
<div><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] annealing acrylic<br></div>
Date: Thu, 3 Apr 2014 11:35:17 +0100<br><br></div>
<div>
<div>
<div>Hi Brian,</div>
<div> </div>
<div>This might be a dumb question, but how did you manage to get such a nice view of the stresses in your viewport? Ive got a polerizing filer which i bought specially, but it didnt seem to work properly. Are you shining a uv light on it or something?<br>
Thanks</div>
<div>James<br><br></div>
<div>On 1 April 2014 17:01, Brian Cox <span dir="ltr"><<a href="mailto:brian@ojaivalleybeefarm.com" target="_blank">brian@ojaivalleybeefarm.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:rgb(204,204,204) 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex">
<div style="FONT-FAMILY:Arial,sans-serif;FONT-SIZE:10pt">
<div>Hi Doug,</div>
<div> I think I'm going to see what finished windows would cost me from Hydrospace. The chamber for the annealing would need to be completely re-thought out. I was thinking that maybe an enclosed liquid, like antifreeze, could be used to circulate through a special chamber that would be surrounded with the liquid. That way you could really get a handle on the exact temperature of a circulating liquid. But still you have to change the temp, maybe a mixing valve. But by the time I got through with that I could probably buy a number of viewports !</div>
<div> </div>
<div>Attached is a shot of the stresses I induced with my bad annealing attempt </div><span><font color="#888888">
<div> </div>
<div>Brian<br><br><br><br><br><br><br><br><br></div></font></span>
<div>
<div>
<div dir="ltr">My sympathies Brian. I'm sorry that your experimental annealing didn't go well, but as they say, it is always better to try and fail than fail to try. It sounds like perhaps you just need to make some modifications to your oven to better regulate temperatures, but I'm sure that is easier said than done. Are you planning to make another attempt? ~ Douglas S. </div>
<div><br><br>
<div>On Tue, Apr 1, 2014 at 10:49 AM, Brian Cox <span dir="ltr"><<a href="mailto:brian@ojaivalleybeefarm.com" target="_blank">brian@ojaivalleybeefarm.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:rgb(204,204,204) 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex">
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<div>Epic Fail ! my attempt to anneal a viewport did not go well. The temps swings were so great that it was impossible to regulate. The mass in the oven that I had hoped would moderate the swings made it so the lag time between the heating cycle and when the thermometer sensor saw the temperature change uncontrollable. And the heat was not even though out the oven as well.</div>
<div> </div>
<div>Brian<br><br>--- <a href="mailto:hanker_20032000@yahoo.ca" target="_blank">hanker_20032000@yahoo.ca</a> wrote:<br><br>From: hank pronk <<a href="mailto:hanker_20032000@yahoo.ca" target="_blank">hanker_20032000@yahoo.ca</a>><br>
To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] annealing acrylic<br>Date: Tue, 25 Mar 2014 05:35:51 -0700 (PDT)<br>
<br></div>
<div style="FONT-FAMILY:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;FONT-SIZE:12pt">
<div><span>Brian,</span></div>
<div><span>I say when in doubt, test. If your not building a test chamber , you can make your sample window to fit my chamber and I will test it for you.</span></div>
<div><span>Hank</span></div>
<div style="DISPLAY:block"><br><br>
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<div dir="ltr"><font face="Arial">On Monday, March 24, 2014 7:23:18 PM, Brian Cox <<a href="mailto:brian@ojaivalleybeefarm.com" target="_blank">brian@ojaivalleybeefarm.com</a>> wrote:<br></font></div>
<div>
<div>
<div>
<div style="FONT-FAMILY:Arial,sans-serif;FONT-SIZE:10pt">
<div>Hank,</div>
<div> I have the book, that's where the annealing schedules are, they vary quite a bit, there is an absolute minimum time and then there is the original recommended time. The recommended time comes out to be around 51 hours where as the shortened time is maybe half that. I'm just doing one test piece to start off with. I was also using the same oven ( a toaster oven I got from Sears for $75 bucks) to heat the welding rod to 250 degrees F before we used the rod ( it had been sitting out for a few days). I was able to keep the temperature fairly even for the welding rod at 250. </div>
<div> </div>
<div>Brian <br><br>--- <a href="mailto:hanker_20032000@yahoo.ca" target="_blank">hanker_20032000@yahoo.ca</a> wrote:<br><br>From: hank pronk <<a href="mailto:hanker_20032000@yahoo.ca" target="_blank">hanker_20032000@yahoo.ca</a>><br>
To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] annealing acrylic<br>Date: Mon, 24 Mar 2014 17:39:27 -0700 (PDT)<br>
<br></div>
<div>
<div style="FONT-FAMILY:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;FONT-SIZE:12pt">
<div><span>Brian,</span></div>
<div><span>Do you have the Stachiw book of Acrylics, I can send you mine if you don't have a copy. There is some pretty important stuff in there.</span></div>
<div><span>Hank</span></div>
<div style="DISPLAY:block"><br><br>
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<div dir="ltr"><font face="Arial">On , hank pronk <<a href="mailto:hanker_20032000@yahoo.ca" target="_blank">hanker_20032000@yahoo.ca</a>> wrote:<br></font></div>
<div>
<div>
<div>
<div style="FONT-FAMILY:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;FONT-SIZE:12pt">
<div><span>Brian,</span></div>
<div><span>How thick is your acrylic? should take more than a night?</span></div>
<div><span>Hank</span></div>
<div style="DISPLAY:block"><br><br>
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<div>
<div dir="ltr"><font face="Arial">On Monday, March 24, 2014 6:33:09 PM, Brian Cox <<a href="mailto:brian@ojaivalleybeefarm.com" target="_blank">brian@ojaivalleybeefarm.com</a>> wrote:<br></font></div>
<div>
<div>
<div>
<div style="FONT-FAMILY:Arial,sans-serif;FONT-SIZE:10pt">
<div>Yes, I have the annealing schedules. I have an electric oven and two digital thermometers, one I'm going to put in a piece of acrylic and the other one I'm going to use to monitor the oven temperature itself . I'm worried that the thermometer in the acrylic won't register until it gets heated throughout, and so then the oven temp might go higher than it should. So between the two readouts I can heat it gradually up. It'll be a long night.</div>
<div> </div>
<div>Brian<br><br>--- <a href="mailto:hanker_20032000@yahoo.ca" target="_blank">hanker_20032000@yahoo.ca</a> wrote:<br><br>From: hank pronk <<a href="mailto:hanker_20032000@yahoo.ca" target="_blank">hanker_20032000@yahoo.ca</a>><br>
To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] annealing acrylic<br>Date: Mon, 24 Mar 2014 17:22:32 -0700 (PDT)<br>
<br></div>
<div>
<div style="FONT-FAMILY:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;FONT-SIZE:12pt">
<div><span>Brian,</span></div>
<div><span>Are you going to anneal your windows yourself? </span></div>
<div><span>Hank </span></div>
<div style="DISPLAY:block"><br><br>
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<div dir="ltr"><font face="Arial">On Monday, March 24, 2014 6:03:10 PM, Brian Cox <<a href="mailto:brian@ojaivalleybeefarm.com" target="_blank">brian@ojaivalleybeefarm.com</a>> wrote:<br></font></div>
<div>
<div>
<div style="FONT-FAMILY:Arial,sans-serif;FONT-SIZE:10pt">
<div>Used my polarized lenses on the newly cut piece and it appears clouded throughout the whole piece. Where as another piece I have, you can clearly see a stress area around where it has been drilled. </div>
<div> </div>
<div>Brian</div>
<div> </div>
<div><br>--- <a href="mailto:emile@airesearch.nl" target="_blank">emile@airesearch.nl</a> wrote:<br><br>From: "Emile van Essen" <<a href="mailto:emile@airesearch.nl" target="_blank">emile@airesearch.nl</a>><br>
To: "'Personal Submersibles General Discussion'" <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] annealing acrylic<br>
Date: Mon, 24 Mar 2014 22:40:46 +0100<br><br></div>
<div>
<div><font color="navy" face="Arial"><span style="FONT-FAMILY:Arial;COLOR:navy;FONT-SIZE:10pt" lang="EN-GB">As far as I know it is only cast.</span></font></div></div>
<div><font color="navy" face="Arial"><span style="FONT-FAMILY:Arial;COLOR:navy;FONT-SIZE:10pt" lang="EN-GB"></span></font> </div></div>
<div><font color="navy" face="Arial"><span style="FONT-FAMILY:Arial;COLOR:navy;FONT-SIZE:10pt" lang="EN-GB">Regards, Emile</span></font> </div>
<div><font color="navy" face="Arial"><span style="FONT-FAMILY:Arial;COLOR:navy;FONT-SIZE:10pt" lang="EN-GB"></span></font>
<div>
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<div><b><font face="Tahoma"><span style="FONT-FAMILY:Tahoma;FONT-SIZE:10pt;FONT-WEIGHT:bold">Van:</span></font></b><font face="Tahoma"><span style="FONT-FAMILY:Tahoma;FONT-SIZE:10pt"> Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org" target="_blank">personal_submersibles-bounces@psubs.org</a>] <b><span style="FONT-WEIGHT:bold">Namens </span></b>Brian Cox<br>
<b><span style="FONT-WEIGHT:bold">Verzonden:</span></b> maandag 24 maart 2014 20:37<br><b><span style="FONT-WEIGHT:bold">Aan:</span></b> PSubs <br><b><span style="FONT-WEIGHT:bold">Onderwerp:</span></b> [PSUBS-MAILIST] annealing acrylic</span></font>
<div></div>
<div><font size="3" face="Times New Roman"><span style="FONT-SIZE:12pt"></span></font>
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<div></div></div>
<div><font face="Arial"><span style="FONT-FAMILY:Arial;FONT-SIZE:10pt">I'm planning on annealing my viewports, does anyone know if the acrylic from the factory is pre-shrunk ?</span></font>
<div></div>
<div><font face="Arial"><span style="FONT-FAMILY:Arial;FONT-SIZE:10pt"></span></font>
<div></div>
<div><font face="Arial"><span style="FONT-FAMILY:Arial;FONT-SIZE:10pt">Brian</span></font> _______________________________________________ Personal_Submersibles mailing list <a>Personal_Submersibles@psubs.org</a> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a> </div>
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